diff --git a/arch/arm/src/imxrt/hardware/rt117x/imxrt117x_iomuxc.h b/arch/arm/src/imxrt/hardware/rt117x/imxrt117x_iomuxc.h
index 64c3f270ae..1c81e396f6 100644
--- a/arch/arm/src/imxrt/hardware/rt117x/imxrt117x_iomuxc.h
+++ b/arch/arm/src/imxrt/hardware/rt117x/imxrt117x_iomuxc.h
@@ -2397,6 +2397,10 @@
 #  define GPR_GPR16_FLEXRAM_BANK_CFG_SEL_FUSE (0 << 2) /*          Use fuse value to configure */
 #  define GPR_GPR16_FLEXRAM_BANK_CFG_SEL_REG  (1 << 2) /*          Use FLEXRAM_BANK_CFG to configure */
 
+#define GPR_GPR16_CM7_FORCE_HCLK            (1 << 3) /* Bit 3:   Force FlexRAM AHB clock during CM7 sleep (CM7_FORCE_HCLK) */
+#  define GPR_GPR16_CM7_FORCE_HCLK_GATED    (0 << 3) /*          When CM7 is sleeping and TCM is not accessible */
+#  define GPR_GPR16_CM7_FORCE_HCLK_ENABLED  (1 << 3) /*          When CM7 is sleeping and TCM is accessible */
+
                                                     /* Bit 4:      Reserved */
 
 #define GPR_GPR16_M7_GPC_SLEEP_SEL             (1 << 5) /* Bit 5:  CM7 sleep request selection (M7_GPC_SLEEP_SEL) */
diff --git a/arch/arm/src/imxrt/imxrt_clockconfig_ver2.c b/arch/arm/src/imxrt/imxrt_clockconfig_ver2.c
index e1fea76fa2..274783c939 100644
--- a/arch/arm/src/imxrt/imxrt_clockconfig_ver2.c
+++ b/arch/arm/src/imxrt/imxrt_clockconfig_ver2.c
@@ -130,8 +130,16 @@ static void imxrt_oscsetup(void)
 
   /* FlexRAM AXI CLK ROOT */
 
-  putreg32(CCM_CG_CTRL_RSTDIV(1) | CCM_CG_CTRL_DIV0(1),
+  putreg32(CCM_CG_CTRL_RSTDIV(3) | CCM_CG_CTRL_DIV0(3),
   IMXRT_CCM_CG_CTRL(0));
+
+  /* Keep TCM clock running during M7 sleep
+   * needed for DMA to read/write from TCM or OCRAM-M7 FlexRAM ECC
+   */
+
+  reg = getreg32(IMXRT_IOMUXC_GPR_GPR16);
+  putreg32(reg | GPR_GPR16_CM7_FORCE_HCLK_ENABLED,
+  IMXRT_IOMUXC_GPR_GPR16);
 }
 
 /****************************************************************************